To whiten teeth, you can follow these tips:

1. Regular Dental Cleaning: Clean your teeth at least twice a day, morning and evening, using a toothbrush and dental floss. Reach every tooth surface using the correct brushing technique.

2. Dentist Check-ups: It is important to visit your dentist at least once a year for routine check-ups. Cleaning deposits such as tartar and plaque is important for the health and whiteness of your teeth.

3. Healthy Diet: A balanced and healthy diet is important for dental health. Avoid sugary and acidic foods and drinks. Also, consuming fiber foods and drinking enough water will keep your teeth clean.

4. Avoid Smoking and Tobacco Products: Smoking and using tobacco products can cause teeth to become yellow and stained. Therefore, staying away from such habits is important for dental health and whiteness.

5. Natural Methods: It is widely believed that natural substances like lemon juice and baking soda are effective in whitening teeth. However, due to the abrasive effect of these substances, they can damage tooth enamel. Therefore, it is important to consult your dentist before using natural methods.

6. Teeth Whitening Products: Teeth whitening products that you can use with the recommendation of your dentist can help whiten your teeth. However, it is important to consult your dentist before using these products.

7. Avoid Stain-Creating Foods and Drinks: Coffee, tea, colored drinks like red wine and some spices can cause stains on the teeth. Try to avoid such foods and drinks as much as possible or limit their consumption.

By following the tips above along with careful oral hygiene and regular dental care, you can keep your teeth white and healthy.